Cannon-pinion for timepieces.



E. H. HORN.

GANNON PINION FOR TIMEPIECES. APPLICATION FILED MAY 7, 1914.

1,104,422. Patented July 21, 1914.

nnrrnn s'ra'rns PATENT OFFICE.

ERNEST H. HORN, OF WATERBURY, CONNECTICUT, ASSIGNOR TO WATERBURY CLOCK 00., OF WATERBURY, CONNECTICUT, A CORPORATION.

CANNON-PINION FOR TIMEPIECES.

Specification of Letters Iatent.

Patented July 21, 1914.

Application filed May 7, 1914. Serial No. 836,924.

To all wlwm it may concern Be it known that I, ERNEST I-I. HORN, a citizen of the United States, residing at Waterbury, in the county of New Haven and State of Connecticut, have invented a new and useful Improvement in CannoirIinions for Timepieces; and I do hereby declare the following, when taken in connection with the accompanying drawings and the characters of reference marked thereon, to be a full, clear, and exact description of the same, and which said drawings constitute part of this application, and represents a sectional view of a time-piece provided with my improved cannon pinion.

My invention relates to an improvement in cannon pinions for time-pieces, the object being to increase the hold of the cannon pinion upon the center-arbor and at the same time to retain the direct bearing of the hour-socket upon the center-arbor, without increasing the thickness of the watch.

With these ends in view, my invention consists in a cannon pinion and hour-socket having certain details of construction as will be'hereinafter described and pointed out in the claim.

In carrying out my invention as herein shown, the cannon pinion 2 is formed upon its outer face with aconcentric hub 3 the bore of which corresponds to the bore of the pinion whereby the pinion is virtually increased in the length of its bearing upon the center-arbor 4-. For the reception of the said hub 3 by means of which I have increased the holding power of the cannon pinion, I form a concentric recess 5 in the rear end of the hour-socket 6, the said recess 5 being sufficiently larger than the external diameter of the hub 3 to entirely clear the same. The said hour-socket 6 is provided at its rear end with an annular flange 7 upon which the hour-wheel 8 is mounted, the cannon pinion 2 being interposed between the flange 7 and hour-wheel 8 and the front face of the front movement-plate 9. The hour-socket 6 which turns loosely upon the center-arbor 4, bears directly upon the center arbor from a point adjacent to the front face of the hub 3 of the cannon pinion 2 to its front end. The projecting forward end of the center-arbor 4 is provided with a minute hand 11.

It will be seen that by recessing the rear end of the hour-socket and providing the forward end of the cannon pinion with a hub increasing the length of its hearing, I am enabled to secure an additional hold upon the center-arbor for the cannon pinion, and at the same time to retain the direct bearing of the hour socket upon the centerarbor without increasing the thickness of the watch in front of the front plate thereof, and without enlarging the diameter of the hour-socket. In this connection I may explain that if the length of the cannon pinion is increased to secure additional hold upon the center arbor and the hour-socket is placed in front of the long cannon-pinion so as to have direct bearing upon the centerarbor, the length of the parts and the thickness of the watch is necessarily increased. On the other hand, if the cannon pinion is provided, as it sometimes has been, with a long forwardly extending sleeve to increase its hold upon the cent-er arbor and the hoursocket is adapted in diameter to fit over this sleeve so as to avoid the thickening of the movement in front of the front plate of the watch, the advantage is lost of having the hour-socket bear directly upon the centerarbor and the watch maker is compelled to make these small parts with great accuracy in order to get them to run true.

My invention by providing the cannon pinion with a forwardly extending hub and the hour-socket with a recess to receive this hub, keeps down the thickness of the watch and at the same time retains the advantages of having the hour-socket run directly upon the cent-er arbor.

While I have spoken of my improvement as a plied to a watch, it is also applicable to c ocks in which, however, there is less necessity, as a rule, for economy of space.

I claim In a time-piece, the combination with the center-arbor thereof, of a cannon pinion fixed upon the center-arbor and provided upon its forward face with a concentric hub virtually increasing the length of its bore In testimony whereof, I have signed this and hence its hold upon the said centerspecification in the presence of two subscribarbor, and an hour-socket bearing directly ing Witnesses.

upon the said center-arbor and loosely ERNEST H. HORN. thereupon and having its rear face formed Witnesses:

with a, concentric recess receiving the said C. WV. SHADER,

hub and larger in vdiameter than the same. J. R. PUTNAM.

copies of this patent may be M10! in eentswach, by addressing the Commissioner of Patent:, Washington, D. 0. 

